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I didn't find anything obvious in the loom, and the FIA switch seemed fine, so I did what Roger suggested and took a wire off the switch to the relay input. It now starts on the button, and I ran it up to temp and it started fine a few times. So, it's definitely improved, I'll wait until next race event before declaring it fixed. Thanks all for your help. Much appreciated.

Thanks all for the suggestions. @cageyH - I replaced the solenoid feed with a new wire instead of the red/brown. Same behaviour. @colindavies - fair point. Charging now. It may have been a little low with repeated starting and start attempts. I'll spend some time working round the loom to see if I find anything obvious. Otherwise, the fallback is the feed from the FIA switch. Thanks Roger.

Ah, thanks revilla. Just measured it while cranking: 8.37V at solenoid. Sounds familar! Used feed from batt into relay and it was over 10V (I didnt hang around to see how high it went as I was doing a decent Mr Tickle impression with my left arm very close to the manifold!) Unfortunately I can't take a wire off the battery (racing regs), but I assume if I poke around a little, I may find either the culprit or a 12v source which doesn't have the resistance/fault. I'll also look at replacing the fuse. @JK - I did remake the connection, but same result.

Scotchlok. I just opened the MRFU and checked the voltage at that pin and also the other two brown wire pins - same readings.

I was getting the click after hot running (and also when cooled down after having suffered it when hot) So, with it clicking repeatedly when cold, I took a fly lead from the solenoid spade to the batt +ve and it fired first time. Aha - relay mod, I thought. So I did that, but still got the click. Connected the fly lead from solenoid to battery again - fired first time. Reconnected the existing red/brown wire from solenoid and took it to battery - fired first time (so that wire is ok) Took my fly lead from batt +ve to relay input (to replace the input from the tapped brown wire going into MFRU), and used red/brown to go from relay output to solenoid - fired first time. So... I must have a current/voltage drop somewhere in the car wiring, because the 'ooomph' coming from the brown wire which I tapped into as input feed for the relay isn't enough. Voltage at battery is 12.28v Voltage at brown wire input into relay is 12.21v Am I on the right lines? Where do I look next for tracking this down? Go easy on me with the electrickery stuff, and feel free to spell it out in noddy terms - I won't be offended! (Car is a 2004 Roadsport K-series with FIA cutout switch.)

Just sent you an email. Thanks, Chris

YHM re: headlight brackets.

Thanks Jonathan, YHM

Hi, Following some gravel excitement at Brands, I'm after 2x Wipac headlight lenses. Like these ones or the glass ones will also do. Does anyone have any in the garage they want rid of? For a racecar, so condition not vitally important. Thanks, Chris

Hi Richard, YHM.

Ed, I've got a LH rear wing in green. I'll drop you a mail with pictures. Flogging stuff from my own wanted ad. Marvellous . 😬

Thanks, YHM.

Yes I do. The existing ones are distributed somewhere around Pembrey.

After a couple of racing incidents, I'm after 2x rear light clusters. Like these ones here Anyone got any lurking in the garage? Thanks, Chris

Hi, yes please, I'll have it. I'll drop you a blatmail with my details.